CN106989917A - Flexibly support the dynamic stiffness measurement device and its measuring method of squeeze film damper - Google Patents
Flexibly support the dynamic stiffness measurement device and its measuring method of squeeze film damper Download PDFInfo
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- CN106989917A CN106989917A CN201710403972.9A CN201710403972A CN106989917A CN 106989917 A CN106989917 A CN 106989917A CN 201710403972 A CN201710403972 A CN 201710403972A CN 106989917 A CN106989917 A CN 106989917A
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- squeeze film
- dynamic stiffness
- inner ring
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The present invention discloses a kind of dynamic stiffness measurement device and its measuring method for flexibly supporting squeeze film damper, flexibly supporting the dynamic stiffness measurement device of squeeze film damper includes support base, resilient support, squeeze film inner ring, squeeze film outer shroud, bearing, model rotor, drive motor and sensor, the flexible support installation cavity of support base, resilient support is fixed in resilient support installation cavity；Squeeze film inner ring sleeve is located at the periphery of resilient support bearing block；Squeeze film exterior ring cap is located at the periphery of squeeze film inner ring, there is gap between squeeze film inner ring and squeeze film outer shroud；Squeeze film outer shroud is fixed on support base；Model rotor is sheathed on the inner ring of bearing, and model rotor is interference fitted with inner ring, and sensor is arranged at squeeze film inner ring, and force snesor is used for the exciting force for sensing squeeze film inner ring, and acceleration transducer is used for the vibration acceleration for sensing squeeze film inner ring.
Description
Technical field
The present invention relates to rotor oscillation control field, in particular to a kind of resilient support squeeze film damper
Dynamic stiffness measurement device and its measuring method.
Background technology
Resilient support squeeze film damper is widely used in Small Aeroengine rotor-bearing system, and it can have
Effect absorbs rotor due to vibrational energy caused by unbalance residual content, is substantially reduced the vibration displacement of rotor and the load of reduction bearing
Lotus, improves the job stability and reliability of engine and extends the working life of bearing.Flexibly support squeeze film damping
The dynamic stiffness of device can Efficient Characterization squeeze film damper damping behavior, therefore obtain squeeze film damper dynamic stiffness pair
In the design for improving squeeze film damper, make it farthest to reduce the vibration of rotor, there is larger construction value.
The dynamic stiffness of squeeze film damper is flexibly supported, can be obtained by way of FEM calculation and experimental test
.The concrete numerical value of dynamic stiffness is obtained by FEM calculation, its basic skills can generally include complete method, "flop-out" method, mould
State addition method etc..Traditional dynamic stiffness experiment, generally requires and uses the rotation field of force that vibrator carrys out model rotor, use force snesor
Exciting force is measured, is measured and responded with acceleration transducer, can calculated by formula and obtain dynamic stiffness.The measurement side of this dynamic stiffness
Formula, the exciting force substantially produced dependent on vibrator comes when model rotor rotates because amount of unbalance generation is to resilient support
The periodic exciting force of squeeze film damper.This method that exciting force is produced by using vibrator so that elasticity branch
Support the state of squeeze film damper after all with the difference of the state in its practical work process, therefore produced using vibrator
Exciting force, and then it is larger to measure the method error of the dynamic stiffness of resilient support squeeze film damper.From existing disclosed data
From the point of view of, have no for resilient support squeeze film damper in practical work process dynamic stiffness measurement mode and device design and
The special report of application.
Above- mentioned information is only used for strengthening the understanding of the background to the present invention disclosed in the background section.
The content of the invention
A primary object of the present invention is to overcome at least one defect of above-mentioned prior art to be propped up there is provided a kind of elasticity
The dynamic stiffness measurement device of squeeze film damper is supportted, to improve measurement accuracy.
Another main purpose of the present invention is to overcome at least one defect of above-mentioned prior art elastic there is provided one kind
Support the dynamic stiffness measurement method of squeeze film damper.
For achieving the above object, the present invention is adopted the following technical scheme that：
According to an aspect of the invention, there is provided a kind of dynamic stiffness measurement dress for flexibly supporting squeeze film damper
Put, the dynamic stiffness measurement device of the resilient support squeeze film damper is including in support base, resilient support, squeeze film
Ring, squeeze film outer shroud, bearing, model rotor, drive motor and sensor, the flexible support of support base are installed
The first installation portion is provided with chamber, the resilient support installation cavity；It is described resilient support with body and by the body one
The resilient support bearing block stretched out is held, the other end of the body has the second installation portion, second installation portion and institute
The matching of the first installation portion is stated, the resilient support is fixed in the resilient support installation cavity；The resilient support bearing
Seat at least partly stretches out in the outside of the resilient support installation cavity；The squeeze film inner ring sleeve is located at the elastic bearing-axis
The periphery of bearing；The squeeze film exterior ring cap is located at the periphery of the squeeze film inner ring, the squeeze film inner ring and institute
State between squeeze film outer shroud and there is gap；The squeeze film outer shroud is fixed on the support base；The outer ring of the bearing
The inner circumferential of the resilient support bearing block is sheathed on, with the resilient support bearing block interference fits；The model rotor is arranged
In the inner ring of the bearing, the model rotor is interference fitted with the inner ring, and the model rotor has to be turned by the simulation
The boss of the outstanding formation of outer peripheral face of son, the inner ring axial limiting of the bearing is in the boss；The drive motor with
The model rotor connection, to drive the model rotor to rotate；The sensor includes force snesor and acceleration transducer；
The sensor is arranged at the squeeze film inner ring, and the force snesor is used for the exciting for sensing the squeeze film inner ring
Power, the acceleration transducer is used for the vibration acceleration for sensing the squeeze film inner ring.
According to an embodiment of the present invention, wherein the squeeze film outer shroud inwall is provided with oil groove and two sealings
Groove, two seal grooves are located at the both sides of the oil groove respectively, and lubricating oil can enter via fuel feed hole and the oil groove
In the gap, sealing ring is equipped with two seal grooves, the sealing ring and the outer wall of the squeeze film inner ring are tight
Close fit.
According to an embodiment of the present invention, wherein the oil groove is along the circumferential cloth of described squeeze film outer shroud inwall
Put, the oil groove is connected with the gap.
According to an embodiment of the present invention, wherein the force snesor includes the first force snesor and the second power is sensed
Device, first force snesor is used for the power for measuring first direction, and second force snesor is used for the power for measuring second direction,
The first direction is vertical with the second direction；The acceleration transducer includes the first acceleration transducer and second and accelerated
Spend sensor, first acceleration transducer measures the acceleration of third direction, the second acceleration transducer measurement the
The acceleration in four directions, the third direction is vertical with the fourth direction.
According to an embodiment of the present invention, wherein the first direction and/or the third direction are horizontal direction, institute
It is vertical direction to state second direction and/or the fourth direction.
According to an embodiment of the present invention, wherein the dynamic stiffness measurement device of the resilient support squeeze film damper
Also include dynamic signal analyzer, the dynamic signal analyzer can receive force snesor sensing exciting force signal and
The vibration response signal of the acceleration transducer sensing, and obtain the vibratory response of the resilient support squeeze film damper
With the relation curve of exciting force.
According to an embodiment of the present invention, wherein the dynamic stiffness measurement device of the resilient support squeeze film damper
Also include lubricating oil source, the lubricating oil source is connected by pipeline with the gap.
According to an embodiment of the present invention, wherein the dynamic stiffness measurement device of the resilient support squeeze film damper
Also include sleeve and fastener, the fastener has internal thread, and the model rotor is sheathed on one end tool in the bearing
There is the external screw thread matched with the internal thread, the sleeve is arranged between the inner ring of the fastener and the bearing.
According to an embodiment of the present invention, it is many wherein the body of the resilient support has multiple mouse cage springs
The individual mouse cage spring is circumferentially distributed on the body.
There is provided a kind of dynamic stiffness measurement side for flexibly supporting squeeze film damper according to another aspect of the present invention
Method, the dynamic stiffness measurement device for the resilient support squeeze film damper that the dynamic stiffness measurement method is provided using the present invention,
The dynamic stiffness measurement method comprises the following steps：
The acceleration a of the horizontal direction of the squeeze film inner ring is measured using the acceleration transducerh(t) it is and vertical
The acceleration a in directionv(t) the dynamic excitation power F of the horizontal direction of squeeze film inner ring described in force sensor measuring, is utilizedh(t)
With the dynamic excitation power F of fourth directionv(t)；
Utilize integral formulaTo the acceleration a of horizontal directionhAnd vertical direction (t)
Acceleration av(t) integrate respectively, to obtain the displacement S of horizontal directionh(t) with the displacement S of vertical directionv(t)；
To the dynamic excitation power F (t) in time domain and vibration displacement S (t) by formulaCarry out Fu
Vertical leaf transformation, obtains the dynamic excitation power F in frequency domainh(ω) and Fv(ω) and vibration displacement Sh(ω) and Sv(ω)；
Calculated by dynamic stiffness calculation formula K (ω)=F (ω)/S (ω) and obtain horizontal direction and the dynamic stiffness of vertical direction
Kh(ω) and Kv(ω)；
Wherein K (ω) is expressed as K (ω)=Re (ω)+jIm (ω), and wherein Re (ω) represents the real part of dynamic stiffness, with bullet
Property the support Static stiffness of squeeze film damper, quality and excited frequency it is relevant；Im (ω)=ω c, with resilient support extruding oil
The damping of film damper is relevant with excited frequency, represents the imaginary part of dynamic stiffness, and c is the resistance of resilient support squeeze film damper
Buddhist nun.
As shown from the above technical solution, the dynamic stiffness measurement device of resilient support squeeze film damper of the invention and its
The advantage and good effect of measuring method are：The dynamic stiffness measurement device can be with direct measurement resilient support squeeze film damping
Dynamic stiffness of the device in practical work process, is different from and existing produce exciting force by vibrator and then measure dynamic stiffness indirectly
Mode, can more realistically reflect damping behavior of the resilient support squeeze film damper in practical work process.
Brief description of the drawings
By being considered in conjunction with the accompanying following the following detailed description of the embodiment of the present invention, various targets of the invention,
Feature and advantage will become apparent.Accompanying drawing is only the exemplary diagram of the present invention, is not necessarily drawn to scale.
In the accompanying drawings, same reference represents same or similar part all the time.Wherein：
Fig. 1 is a kind of stiffness measurement dress of resilient support squeeze film damper according to an illustrative embodiments
The structural representation put；
Fig. 2 is a kind of stiffness measurement dress of resilient support squeeze film damper according to an illustrative embodiments
The structure chart put；
Fig. 3 is the A-A profiles in Fig. 2；
Fig. 4 is the B-B profiles in Fig. 2；
Fig. 5 is the partial enlarged drawing of part in C circles in Fig. 4.
Wherein, description of reference numerals is as follows：
1st, support base；2nd, flexibly support；
3rd, squeeze film inner ring；4th, bearing；
5th, model rotor；6th, squeeze film outer shroud；
10th, installation cavity is flexibly supported；20th, the second installation portion；
21st, body；22nd, bearing block is flexibly supported；
50th, boss；30th, oil film chamber；
7th, pipeline；8th, sleeve；
9th, nut；110th, horizontal direction acceleration transducer；
111st, vertical direction acceleration transducer；112nd, horizontal direction force snesor；
113rd, vertical direction force snesor；60th, fuel feed hole；
61st, oil groove；140th, bolt；
150th, nut；62nd, the second seal groove；
63rd, the first seal groove；100th, the first sealing ring；
101st, the second sealing ring；
Embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the present invention more
Fully and completely, and by the design of example embodiment those skilled in the art is comprehensively conveyed to.Identical accompanying drawing in figure
Mark represents same or similar structure, thus will omit their detailed description.
According to an aspect of the present invention there is provided a kind of dynamic stiffness measurement device for flexibly supporting squeeze film damper,
Flexibly supporting the dynamic stiffness measurement device of squeeze film damper includes support base 1, flexibly supports 2, squeeze film inner ring 3, squeezes
Film outer shroud 6, bearing 4, model rotor 5, drive motor and sensor are pressed oil, support base 1 can be with flexible support installation cavity
10, the first installation portion can be provided with by flexibly supporting in installation cavity 10.Resilient support 2 can have body 21 and by body 21
The resilient support bearing block 22 that one end stretches out, the other end of body 21 can have the second installation portion 20, the second installation portion
20 can be matched with the first installation portion, and resilient support 2 is fixed in resilient support installation cavity 10.First installation portion can be with
Second installation portion 20 is connected by fastener, and the fastener can be rivet or bolt, but be not limited, the first installation portion
The position being mutually matched with the second installation portion 20 can be respectively arranged with through hole, can be by 8 bolts 140 and matched
Nut 150 coordinates, and bolt 140 is fixed in through hole, resilient support 2 is fixed on support base 1 with realizing, all in this hair
In bright protection domain.
Reference picture 3 and Fig. 4, resilient support at least part of bearing block 22 can stretch out in the outer of resilient support installation cavity 10
Portion, squeeze film inner ring 3 can be sheathed on the periphery of resilient support bearing block 22, and squeeze film outer shroud 6 can be sheathed on extruding
The periphery of oil film inner ring 3, along the axis direction of squeeze film inner ring 3, the axial length of squeeze film inner ring 3 can be more than extruding
The axial length of oil film outer shroud 6, thus squeeze film inner ring 3 is outstanding relative to squeeze film outer shroud 6, by force snesor
On the protuberance that the squeeze film inner ring 3 is arranged at acceleration transducer.
Squeeze film outer shroud 6 can be fixed on support base 1.The outer ring of bearing 4 can be sheathed on resilient support bearing block
22 inner circumferential, with the resilient support interference fits of bearing block 22.Model rotor 5 can be sheathed on the inner ring of bearing 4, model rotor 5
With inner ring be interference fitted, model rotor 5 have by model rotor 5 the outstanding boss 50 formed of outer peripheral face, bearing 4 it is interior
Axial limiting is enclosed in boss 50.According to the embodiment of the present invention, its middle (center) bearing 4 can be sheathed on model rotor 5
The periphery of one end with boss 50, so that the inner ring of bearing 4 is resisted against the boss 50, can also set in the opposite side of bearing 4
Sleeve 8 is put, by the way that fastener to be fixed on to end with boss 50 of the model rotor 5, sleeve 8 can be resisted against bearing
On 4 inner rings, so as to carry out axial limiting to bearing 4.Drive motor is connected with model rotor 5, to drive model rotor 5 to revolve
Turn；Sensor includes force snesor and acceleration transducer；Sensor is arranged at squeeze film inner ring 3, and force snesor is used to feel
The exciting force of squeeze film inner ring 3 is surveyed, acceleration transducer is used for the vibration acceleration for sensing squeeze film inner ring 3.According to this
One embodiment of invention, wherein force snesor and acceleration transducer can be fixed in squeeze film by fastener
On ring 3, other connected modes it can also be fixed on by glue etc. in squeeze film inner ring 3, all the protection model in the present invention
In enclosing.
With continued reference to Fig. 5, according to the embodiment of the present invention, wherein squeeze film inner ring 3 can be with extruding oil
There is gap between film outer shroud 6, the inwall of squeeze film outer shroud 6 is provided with oil groove 61 and two seal grooves, two seal groove difference
For the first seal groove 63 and the second seal groove 62, two seal grooves are located at the both sides of oil groove 61 respectively, and lubricating oil can be via entering
Oilhole 60 and oil groove 61 enter in gap, and being equipped with two seal grooves can in sealing ring, reference picture 5, the first seal groove 63
The second sealing ring 101 can be provided with to be provided with the first sealing ring 100, the second seal groove 62, the two sealing rings are with squeezing
The outer wall for pressing oil film inner ring 3 is fitted close, between the first sealing ring 100 and the second sealing ring 101, and in squeeze film
Oil film chamber 30 is formed between ring 3 and squeeze film outer shroud 6.According to the embodiment of the present invention, the wherein edge of oil groove 61
Circumferentially, oil groove 61 is connected squeeze film outer shroud inwall with oil film chamber 30, all within the scope of the present invention.
According to the embodiment of the present invention, the wherein oil film chamber 30 is connected by pipeline 7 with lubricating oil source, according to this
An embodiment is invented, wherein oil pump can be provided between oil film chamber 30 and lubricating oil source, the oil pump can be set
In on pipeline 7, but it is not limited, all within the scope of the present invention.According to the embodiment of the present invention, wherein
Fuel feed hole 60 is also provided with squeeze film outer shroud 6, lubricating oil can be entered in oil film chamber 30 by the fuel feed hole 60.
According to the embodiment of the present invention, wherein fuel feed hole 60 can be provided with screw thread on hole wall, be connected with facilitating with pipeline 7
Connect.
According to the embodiment of the present invention, wherein force snesor includes the first force snesor and the second power is sensed
Device, the first force snesor can be used for the power for measuring first direction, and the second force snesor can be used for the power for measuring second direction,
First direction can be vertical with second direction.According to the embodiment of the present invention, wherein first direction can be level
Direction, second direction can be vertical direction, but be not limited.First force snesor can be horizontal direction force snesor
112, the second force snesor can be vertical direction force snesor 113.Acceleration transducer can include the first acceleration sensing
Device and the second acceleration transducer, the first acceleration transducer can measure the acceleration of third direction, the second acceleration sensing
Device can measure the acceleration of fourth direction, and third direction can be vertical with fourth direction.According to the specific implementation of the present invention
Mode, third direction can be horizontal direction, and fourth direction can be vertical direction, but be not limited.First acceleration is passed
Sensor can be horizontal direction acceleration transducer 110, and the second acceleration transducer can be vertical direction acceleration transducer
111, but be not limited.
Reference picture 1, according to the embodiment of the present invention, wherein the dynamic stiffness of resilient support squeeze film damper
Measurement apparatus also include dynamic signal analyzer, dynamic signal analyzer can receive force snesor sensing exciting force signal and
The vibration response signal of acceleration transducer sensing, and obtain vibratory response and the exciting force of resilient support squeeze film damper
Relation curve.During model rotor 5 rotates, because exciting force caused by imbalance of model rotor 5 etc. passes through axle
Holding 4 can be for delivery on resilient support squeeze film damper, and the force snesor in squeeze film inner ring 3 can be used for surveying
The exciting force that model rotor 5 applies on amount resilient support squeeze film damper, acceleration transducer can be used for measurement elasticity
Support the vibratory response on squeeze film damper, the signal for then measuring force snesor and acceleration transducer respectively through
After charge amplifier amplification in access dynamic signal analyzer, practical work process can be obtained by further analyzing and processing
The dynamic stiffness parameter of middle resilient support squeeze film damper.
According to the embodiment of the present invention, wherein the dynamic stiffness measurement device of resilient support squeeze film damper
Also include sleeve 8 and fastener, fastener has an internal thread, one end that model rotor 5 can be sheathed in bearing 4 have with it is interior
The external screw thread of screw thread matching, sleeve 8 can be arranged between the inner ring of fastener and bearing 4.It is specific real according to the one of the present invention
Mode is applied, wherein fastener can be nut 9, can be by bearing 4 by the way that nut 9 is fastened on the external screw thread of model rotor 5
It is axially positioned on model rotor 5.According to the embodiment of the present invention, the external diameter of its middle sleeve 8 can be less than bearing 4
The external diameter of inner ring, so as to so that the end face of sleeve 8 is fully contacted with the inner ring of bearing 4, prevent sleeve 8 to bearing 4 again
Outer ring interfered.
According to another aspect of the present invention there is provided a kind of dynamic stiffness measurement method for flexibly supporting squeeze film damper,
It is characterised in that it includes following steps：
The acceleration a of the horizontal direction of squeeze film inner ring 3 is measured using acceleration transducerh(t) with vertical direction
Acceleration av(t), using force sensor measuring squeeze film inner ring 3 horizontal direction dynamic excitation power FhAnd vertical direction (t)
Dynamic excitation power Fv(t)；
To the acceleration a of horizontal directionh(t) with the acceleration a of vertical directionv(t) integrate respectively, to obtain horizontal direction
Displacement Sh(t) with the displacement S of vertical directionv(t)；
To the dynamic excitation power F (t) in time domain and vibration displacement S (t) by formulaCarry out Fu
Vertical leaf transformation, obtains the dynamic excitation power F in frequency domainh(ω) and Fv(ω) and vibration displacement Sh(ω) and Sv(ω)；
Calculated by dynamic stiffness calculation formula K (ω)=F (ω)/S (ω) and obtain horizontal direction and the dynamic stiffness of vertical direction
Kh(ω) and Kv(ω)；
Wherein K (ω) is expressed as K (ω)=Re (ω)+jIm (ω), and wherein Re (ω) represents the real part of dynamic stiffness, with bullet
Property support squeeze film damper Static stiffness k, quality m and excited frequency it is relevant；Im (ω)=ω c, is extruded with resilient support
The damping of film damper is relevant with excited frequency, represents the imaginary part of dynamic stiffness, and c is the resistance of resilient support squeeze film damper
Buddhist nun.
When model rotor 5 rotates at a high speed, due to the dynamic excitation power caused by factor such as imbalance of model rotor 5, pass through axle
4, resilient support bearing block 22 is held to reach in squeeze film inner ring 3.In squeeze film inner ring 3, passed by horizontal direction acceleration
Sensor 110 and vertical direction acceleration transducer 111 and 113 points of horizontal direction force snesor 112 and vertical direction force snesor
The vibration acceleration a in two mutually perpendicular directions is not measuredhAnd a (t)v(t) with dynamic excitation power FhAnd F (t)v(t).By formulaTo vibration acceleration signal ahAnd a (t)v(t) it is integrated, obtains vibration displacement signal
ShAnd S (t)v(t).Then, by formulaAgain to the dynamic excitation power F in the time domain that collects
(t) Fourier transform is carried out with vibration displacement S (t), obtains the dynamic excitation power F in frequency domainh(ω) and Fv(ω) and vibration displacement
Sh(ω) and Sv(ω).Calculated finally according to dynamic stiffness calculation formula K (ω)=F (ω)/S (ω) and obtain horizontal direction and vertical
The dynamic stiffness K in directionh(ω) and Kv(ω).Dynamic stiffness K (ω) is represented by K (ω)=Re (ω)+jIm (ω), wherein Re (ω)
The real part of dynamic stiffness can be represented, it is relevant with the Static stiffness of squeeze film damper, quality and excited frequency；Im (ω)=ω c, with
The damping of squeeze film damper is relevant with excited frequency, represents the imaginary part of dynamic stiffness.Thus, squeeze film damper can be tried to achieve
Damping c=Im (ω)/ω.
To sum up, the dynamic stiffness measurement device and its measuring method for the resilient support squeeze film damper that the present invention is provided
Advantage and beneficial effect are：The dynamic stiffness measurement device can flexibly support squeeze film damper in actual work with direct measurement
Dynamic stiffness during work, is different from existing by way of vibrator produces exciting force and then measures dynamic stiffness indirectly, energy
More realistically reflection flexibly supports damping behavior of the squeeze film damper in practical work process.Except this, squeeze film hinders
Buddhist nun's device dynamic stiffness measurement method is feasible, and measurement apparatus is reasonable in design.
Dynamic stiffness is to weigh the common counter of structure vibration resistance, and structure is under dynamic force effect, and dynamic stiffness is bigger, vibration
Amount is smaller；Conversely, dynamic stiffness is smaller, vibratory output is bigger.In resonance region, dynamic stiffness typically only has the part to ten of Static stiffness
Part.The dynamic stiffness characteristic of analytical structure, research improves the approach of dynamic stiffness, can reasonably carry out structure dynamics and set
Meter, eliminates the weak link in structure, strengthens its antivibration, impact resistance.
Dynamic stiffness is not a constant, but is changed with the change of excited frequency, is the function of excited frequency, when sharp
When vibration frequency is equal to system frequency, dynamic stiffness reaches minimum.Dynamic stiffness is a plural number, while including the width of dynamic stiffness
Frequency and phase frequency information.For the system of a determination, the numerical value of dynamic stiffness depends on the parameter of structure in itself：Static stiffness k, damping
C and quality m.
Described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner
In.Embodiments of the present invention are fully understood so as to provide there is provided many details in superincumbent description.However,
It will be appreciated by persons skilled in the art that technical scheme can be put into practice without one or more in specific detail,
Or can be using other methods, component, material etc..In other cases, it is not shown in detail or describes known features, material
Or operate to avoid fuzzy each aspect of the present invention.
Claims (10)
1. a kind of dynamic stiffness measurement device for flexibly supporting squeeze film damper, it is characterised in that the resilient support extruding
The dynamic stiffness measurement device of film damper includes：
The first installation portion is provided with support base, the flexible support installation cavity of support base, the resilient support installation cavity；
Resilient support, the resilient support has body and the resilient support bearing block stretched out by one end of the body,
The other end of the body has the second installation portion, and second installation portion is matched with first installation portion, by the bullet
Property support be fixed on it is described resilient support installation cavity in；The resilient support bearing block at least partly stretches out in the resilient support
The outside of installation cavity；
Squeeze film inner ring, the squeeze film inner ring sleeve is located at the periphery of the resilient support bearing block；
Squeeze film outer shroud, the squeeze film exterior ring cap is located in the periphery of the squeeze film inner ring, the squeeze film
There is gap between ring and the squeeze film outer shroud；The squeeze film outer shroud is fixed on the support base；
Bearing, the outer ring of the bearing is sheathed on the inner circumferential of the resilient support bearing block, with the resilient support bearing block mistake
Cross cooperation；
Model rotor, the model rotor is sheathed on the inner ring of the bearing, and the model rotor is interference fitted with the inner ring,
The model rotor has the outstanding boss formed of outer peripheral face by the model rotor, and the inner ring of the bearing is axially limited
Positioned at the boss；
Drive motor, the drive motor is connected with the model rotor, to drive the model rotor to rotate；
Sensor, the sensor includes force snesor and acceleration transducer；The sensor is arranged at the squeeze film
Inner ring, the force snesor is used for the exciting force for sensing the squeeze film inner ring, and the acceleration transducer is used to sense institute
State the vibration acceleration of squeeze film inner ring.
2. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 1, it is characterised in that described
Squeeze film outer shroud inwall is provided with oil groove and two seal grooves, and two seal grooves are located at the two of the oil groove respectively
Side, lubricating oil can enter in the gap via fuel feed hole and the oil groove, and sealing ring is equipped with two seal grooves,
The sealing ring and the outer wall of the squeeze film inner ring are fitted close.
3. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 2, it is characterised in that described
Along the squeeze film outer shroud inwall circumferentially, the oil groove is connected oil groove with the gap.
4. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 1, it is characterised in that described
Force snesor includes the first force snesor and the second force snesor, and first force snesor is used for the power for measuring first direction,
Second force snesor is used for the power for measuring second direction, and the first direction is vertical with the second direction；It is described to accelerate
Spending sensor includes the first acceleration transducer and the second acceleration transducer, and first acceleration transducer measures third party
To acceleration, second acceleration transducer measures the acceleration of fourth direction, the third direction and the four directions
To vertical.
5. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 4, it is characterised in that described
First direction and/or the third direction are horizontal direction, and the second direction and/or the fourth direction are vertical direction.
6. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 1, it is characterised in that described
Flexibly supporting the dynamic stiffness measurement device of squeeze film damper also includes dynamic signal analyzer, the dynamic signal analyzer
The exciting force signal of the force snesor sensing and the vibration response signal of acceleration transducer sensing can be received, and is obtained
Obtain the vibratory response of the resilient support squeeze film damper and the relation curve of exciting force.
7. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 1, it is characterised in that described
Flexibly support squeeze film damper dynamic stiffness measurement device also include lubricating oil source, the lubricating oil source by pipeline and it is described between
Gap is connected.
8. the dynamic stiffness measurement device of squeeze film damper is flexibly supported as claimed in claim 1, it is characterised in that described
Flexibly supporting the dynamic stiffness measurement device of squeeze film damper also includes sleeve and fastener, and the fastener has interior spiral shell
Line, one end that the model rotor is sheathed in the bearing has the external screw thread matched with the internal thread, and the sleeve is set
Between the inner ring for being placed in the fastener and the bearing.
9. the dynamic stiffness measurement device of the resilient support squeeze film damper as any one of claim 1 to 8, it is special
Levy and be, the body of the resilient support has multiple mouse cage springs, and multiple mouse cage springs are circumferentially distributed in described
On body.
10. a kind of dynamic stiffness measurement method for flexibly supporting squeeze film damper, the dynamic stiffness measurement method is used as weighed
Profit requires the dynamic stiffness measurement device of the resilient support squeeze film damper any one of 1 to 9, it is characterised in that institute
Dynamic stiffness measurement method is stated to comprise the following steps：
The acceleration a of the horizontal direction of the squeeze film inner ring is measured using the acceleration transducerhAnd vertical direction (t)
Acceleration av(t) the dynamic excitation power F of the horizontal direction of squeeze film inner ring described in force sensor measuring, is utilizedh(t) it is and perpendicular
Nogata to dynamic excitation power Fv(t)；
Utilize integral formulaTo the acceleration a of horizontal directionh(t) and vertical direction plus
Speed av(t) integrate respectively, to obtain the displacement S of horizontal directionh(t) with the displacement S of vertical directionv(t)；
To the dynamic excitation power F (t) in time domain and vibration displacement S (t) by formulaCarry out Fourier change
Change, obtain the dynamic excitation power F in frequency domainh(ω) and Fv(ω) and vibration displacement Sh(ω) and Sv(ω)；
The dynamic stiffness K for obtaining horizontal direction and vertical direction is calculated by dynamic stiffness calculation formula K (ω)=F (ω)/S (ω)h(ω)
And Kv(ω)；
Wherein K (ω) is expressed as K (ω)=Re (ω)+jIm (ω), and wherein Re (ω) represents the real part of dynamic stiffness, with elasticity branch
Static stiffness, quality and the excited frequency for supportting squeeze film damper are relevant；Im (ω)=ω c, with resilient support squeeze film resistance
The damping of Buddhist nun's device is relevant with excited frequency, represents the imaginary part of dynamic stiffness, and c is the damping of resilient support squeeze film damper.
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| CN108303241A (en) * | 2017-12-28 | 2018-07-20 | 西安理工大学 | A kind of modularization oil-film damping test device and method |
| CN108487949A (en) * | 2018-06-28 | 2018-09-04 | 西安交通大学 | A kind of aero-engine adaptive damping squeeze film damper |
| CN108663214A (en) * | 2018-04-28 | 2018-10-16 | 北京航天动力研究所 | A kind of support component and test method for the experiment of high speed rotor analog simulation |
| CN109058380A (en) * | 2018-07-31 | 2018-12-21 | 中国航发湖南动力机械研究所 | Mouse cage bullet branch metal-rubber damper |
| CN109764088A (en) * | 2019-01-09 | 2019-05-17 | 东南大学 | A kind of squeeze film thickness adjusting apparatus |
| CN112344988A (en) * | 2020-10-15 | 2021-02-09 | 南京航空航天大学 | Measuring device for oil pressure and temperature of inlet of squeeze film damper |
| CN112945491A (en) * | 2021-03-31 | 2021-06-11 | 上海堃熠工程减震科技有限公司 | Monitoring system capable of realizing inspection-free and maintenance-free after shock of damper |
| CN113758697A (en) * | 2021-09-22 | 2021-12-07 | 哈尔滨工业大学 | Recognition method for dynamics coefficient of squeeze film damper |
| CN113984365A (en) * | 2021-11-02 | 2022-01-28 | 哈尔滨工业大学 | Novel measurement device for dynamic coefficient of squeeze film damper |
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| CN108303241A (en) * | 2017-12-28 | 2018-07-20 | 西安理工大学 | A kind of modularization oil-film damping test device and method |
| CN108663214A (en) * | 2018-04-28 | 2018-10-16 | 北京航天动力研究所 | A kind of support component and test method for the experiment of high speed rotor analog simulation |
| CN108487949A (en) * | 2018-06-28 | 2018-09-04 | 西安交通大学 | A kind of aero-engine adaptive damping squeeze film damper |
| CN108487949B (en) * | 2018-06-28 | 2020-08-18 | 西安交通大学 | Variable damping squeeze oil film damper for aircraft engine |
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| CN112344988A (en) * | 2020-10-15 | 2021-02-09 | 南京航空航天大学 | Measuring device for oil pressure and temperature of inlet of squeeze film damper |
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| CN112945491B (en) * | 2021-03-31 | 2023-06-27 | 上海堃熠工程减震科技有限公司 | Monitoring method capable of realizing post-earthquake inspection-free repair-free of damper |
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